I04 



appears a lillle more than onc and a li a 1 f as long as the peduncle, i. c. as the 

 distance (21 mm.) between its tip and the frontal margin of the carapace-, the basal portion of 

 this flagellum, broadened and furrowed both in the male and in the female, is 9 mm. long, 

 almost one-third its length ; the other flagellum is one-fourth shorter. The antennular flagella 

 are apparently longer than those of I\ mergttiensis de Man. 



The flao^ella of the outer antennae seem to be a little shorter than those of P. nicrmiensis : 

 the flagellum of a female long 140 mm. of the variety longirostris measures 185 mm., but in a 

 female of the same size of P. iiierg7iiensis it is 225 mm. long. The external maxillipeds of the 

 largest specimen reach as far forward as the antepenultimate joint of the antennular peduncle, 

 i. e. to the middle of the antenna! scale; as no male was collected, I cannot say whether the 

 dactylus shows the same characters as in the typical P. indictis. The legs of the i**^ pair reach 

 with their fingers beyond the tip of the antennal peduncle, those of the 2"^^ extend almost to 

 the distal end of the penultimate joint of the antennular peduncle, whereas the ^"^ legs reach 

 with their fingers beyond the end of this peduncle. The legs perfectly well agree, as regards 

 their form, with Alcock's figure 3 ^). 



The 6 specimens, males and females, from the Bay of Bima, are all young; they were 

 taken together with specimens of P. merguiensis de Man. The largest is a female long 105 mm. 

 The rostrum, distinctly curved upward, projects with one-third of its free portion beyond the 

 antennal scales and is ^ dentate; the foremost tooth, situated opposite the base of the 4"^ lower 

 tooth, is but little farther distant from the anterior margin of the carapace than from the tip 

 of the rostrum ; the foremost tooth of the lower margin is much smaller than the preceding 

 and stands ne-ar the tip, this tooth being almost 3-times as far distant from the 5* as from the 

 extremity of the rostrum. 



The rostrum of a younger female, long 80 mm., projects with two-fifths of its free 

 portion beyond the scales, is distinctly turned upward and also ^-dentate; the foremost tooth 

 of the upper margin, situated opposite the 3"^ of the lower, is a trifle farther distant from the 

 tip of the rostrum than from the frontal margin of the carapace. In a young male the rostrum 

 is f-dentate and the 4"' tooth of the lower margin is situated just in advance of the most 

 anterior tooth of the upper. The formulae of the three other specimens are y, y and \. 



General distribution; Makassar (de Man). 



f46. Peiiaais mcrgtiiensis de Man. 



Penaeus merguiensis J. G. de Man, Journal Linn. Soc. Zool. XXII, 1888, p. 287, PI. 18, Fig. 8. 

 Penaeus indicus C. Spence Bate, Report Challenger Macrura, 1888, p. 248, PI. XXXIII, Fig. 2. 

 Penaeus indicus J. G. de Man, in: Max Weber's Zool. Ergebn. II, 1892, p. 5 1 1 (partim) and 



in: Zool. Jahrb. X. Abth. f. Syst. 1898, p. 680. 

 Penaeus indicus, var. merguiensis A. Alcock, Ann. Mag. Nat. Hist. (7) XVI, 1905, p. 515 and 



Catal. Indian Decap. Crust. Part III. Macrura. Fase. i. Calcutta, 1906, p. 13, PI. II, Fig. 4. 



1) In Spence Bate's figure of the type specimen of /'. huiicus in the Paris Museum (in: Ann. Mag. Nat. Hist. (5) VIIl, 1881, 

 p. 177, PI. .\II, Fig. 5) the thoracic legs show a more sleuder appearance than those of the "Siboga" specimens or than in 

 Alcock's figure 3. Bate's figure is theiefore probalily inaccuraiL'. 



104 . 



